diff --git a/src/apps/cs2cs.cpp b/src/apps/cs2cs.cpp
index 88353bf8f0..551249235e 100644
--- a/src/apps/cs2cs.cpp
+++ b/src/apps/cs2cs.cpp
@@ -36,6 +36,7 @@
 #include <string.h>
 
 #include <cassert>
+#include <cmath>
 #include <cstdint>
 #include <iostream>
 #include <string>
@@ -448,9 +449,23 @@ int main(int argc, char **argv) {
                 std::exit(1);
             }
             try {
-                bboxFilter = Extent::createFromBBOX(
-                                 c_locale_stod(bbox[0]), c_locale_stod(bbox[1]),
-                                 c_locale_stod(bbox[2]), c_locale_stod(bbox[3]))
+                std::vector<double> bboxValues = {
+                    c_locale_stod(bbox[0]), c_locale_stod(bbox[1]),
+                    c_locale_stod(bbox[2]), c_locale_stod(bbox[3])};
+                const double west = bboxValues[0];
+                const double south = bboxValues[1];
+                const double east = bboxValues[2];
+                const double north = bboxValues[3];
+                constexpr double SOME_MARGIN = 10;
+                if (south < -90 - SOME_MARGIN && std::fabs(west) <= 90 &&
+                    std::fabs(east) <= 90)
+                    std::cerr << "Warning: suspicious south latitude: " << south
+                              << std::endl;
+                if (north > 90 + SOME_MARGIN && std::fabs(west) <= 90 &&
+                    std::fabs(east) <= 90)
+                    std::cerr << "Warning: suspicious north latitude: " << north
+                              << std::endl;
+                bboxFilter = Extent::createFromBBOX(west, south, east, north)
                                  .as_nullable();
             } catch (const std::exception &e) {
                 std::cerr << "Invalid value for option --bbox: " << bboxStr
diff --git a/src/apps/projinfo.cpp b/src/apps/projinfo.cpp
index b432e0867d..a100327b22 100644
--- a/src/apps/projinfo.cpp
+++ b/src/apps/projinfo.cpp
@@ -30,6 +30,7 @@
 
 #define FROM_PROJ_CPP
 
+#include <cmath>
 #include <cstdlib>
 #include <fstream> // std::ifstream
 #include <iostream>
@@ -187,9 +188,21 @@ static ExtentPtr makeBboxFilter(DatabaseContextPtr dbContext,
             std::vector<double> bboxValues = {
                 c_locale_stod(bbox[0]), c_locale_stod(bbox[1]),
                 c_locale_stod(bbox[2]), c_locale_stod(bbox[3])};
-            bboxFilter = Extent::createFromBBOX(bboxValues[0], bboxValues[1],
-                                                bboxValues[2], bboxValues[3])
-                             .as_nullable();
+            const double west = bboxValues[0];
+            const double south = bboxValues[1];
+            const double east = bboxValues[2];
+            const double north = bboxValues[3];
+            constexpr double SOME_MARGIN = 10;
+            if (south < -90 - SOME_MARGIN && std::fabs(west) <= 90 &&
+                std::fabs(east) <= 90)
+                std::cerr << "Warning: suspicious south latitude: " << south
+                          << std::endl;
+            if (north > 90 + SOME_MARGIN && std::fabs(west) <= 90 &&
+                std::fabs(east) <= 90)
+                std::cerr << "Warning: suspicious north latitude: " << north
+                          << std::endl;
+            bboxFilter =
+                Extent::createFromBBOX(west, south, east, north).as_nullable();
         } catch (const std::exception &e) {
             std::cerr << "Invalid value for option --bbox: " << bboxStr << ", "
                       << e.what() << std::endl;
diff --git a/src/iso19111/metadata.cpp b/src/iso19111/metadata.cpp
index 148cad191e..6c0a420690 100644
--- a/src/iso19111/metadata.cpp
+++ b/src/iso19111/metadata.cpp
@@ -238,6 +238,27 @@ GeographicBoundingBoxNNPtr GeographicBoundingBox::create(double west,
         throw InvalidValueTypeException(
             "GeographicBoundingBox::create() does not accept NaN values");
     }
+    if (south > north) {
+        throw InvalidValueTypeException(
+            "GeographicBoundingBox::create() does not accept south > north");
+    }
+    // Avoid creating a degenerate bounding box if reduced to a point or a line
+    if (west == east) {
+        if (west > -180)
+            west =
+                std::nextafter(west, -std::numeric_limits<double>::infinity());
+        if (east < 180)
+            east =
+                std::nextafter(east, std::numeric_limits<double>::infinity());
+    }
+    if (south == north) {
+        if (south > -90)
+            south =
+                std::nextafter(south, -std::numeric_limits<double>::infinity());
+        if (north < 90)
+            north =
+                std::nextafter(north, std::numeric_limits<double>::infinity());
+    }
     return GeographicBoundingBox::nn_make_shared<GeographicBoundingBox>(
         west, south, east, north);
 }
diff --git a/test/unit/test_metadata.cpp b/test/unit/test_metadata.cpp
index 6b21728293..da65c9740b 100644
--- a/test/unit/test_metadata.cpp
+++ b/test/unit/test_metadata.cpp
@@ -284,16 +284,6 @@ TEST(metadata, extent_edge_cases) {
         optional<std::string>(), std::vector<GeographicExtentNNPtr>(),
         std::vector<VerticalExtentNNPtr>(), std::vector<TemporalExtentNNPtr>());
 
-    {
-        auto A = Extent::createFromBBOX(-180, -90, 180, 90);
-        auto B = Extent::createFromBBOX(180, -90, 180, 90);
-        EXPECT_FALSE(A->intersects(B));
-        EXPECT_FALSE(B->intersects(A));
-        EXPECT_FALSE(A->contains(B));
-        EXPECT_TRUE(A->intersection(B) == nullptr);
-        EXPECT_TRUE(B->intersection(A) == nullptr);
-    }
-
     EXPECT_THROW(Extent::createFromBBOX(
                      std::numeric_limits<double>::quiet_NaN(), -90, 180, 90),
                  InvalidValueTypeException);
@@ -307,6 +297,10 @@ TEST(metadata, extent_edge_cases) {
                      -180, -90, 180, std::numeric_limits<double>::quiet_NaN()),
                  InvalidValueTypeException);
 
+    // South > north
+    EXPECT_THROW(Extent::createFromBBOX(-100, 10, 100, 0),
+                 InvalidValueTypeException);
+
     // Scenario of https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=57328
     // and https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=60084
     {
@@ -325,6 +319,66 @@ TEST(metadata, extent_edge_cases) {
         EXPECT_TRUE(A->intersection(B) == nullptr);
         EXPECT_TRUE(B->intersection(A) == nullptr);
     }
+
+    // Test degenerate bounding box on a point
+    {
+        auto A = Extent::createFromBBOX(1, 2, 1, 2);
+        auto B = Extent::createFromBBOX(-10, -10, 10, 10);
+        EXPECT_TRUE(A->intersects(B));
+        EXPECT_TRUE(B->intersects(A));
+        EXPECT_FALSE(A->contains(B));
+        EXPECT_TRUE(B->contains(A));
+        EXPECT_TRUE(A->intersection(B) != nullptr);
+        EXPECT_TRUE(B->intersection(A) != nullptr);
+    }
+
+    // Test degenerate bounding box on a line at long=-180
+    {
+        auto A = Extent::createFromBBOX(-180, 2, -180, 3);
+        auto B = Extent::createFromBBOX(-180, -90, 180, 90);
+        EXPECT_TRUE(A->intersects(B));
+        EXPECT_TRUE(B->intersects(A));
+        EXPECT_FALSE(A->contains(B));
+        EXPECT_TRUE(B->contains(A));
+        EXPECT_TRUE(A->intersection(B) != nullptr);
+        EXPECT_TRUE(B->intersection(A) != nullptr);
+    }
+
+    // Test degenerate bounding box on a line at long=180
+    {
+        auto A = Extent::createFromBBOX(180, 2, 180, 3);
+        auto B = Extent::createFromBBOX(-180, -90, 180, 90);
+        EXPECT_TRUE(A->intersects(B));
+        EXPECT_TRUE(B->intersects(A));
+        EXPECT_FALSE(A->contains(B));
+        EXPECT_TRUE(B->contains(A));
+        EXPECT_TRUE(A->intersection(B) != nullptr);
+        EXPECT_TRUE(B->intersection(A) != nullptr);
+    }
+
+    // Test degenerate bounding box on a line at lat=90
+    {
+        auto A = Extent::createFromBBOX(2, 90, 3, 90);
+        auto B = Extent::createFromBBOX(-180, -90, 180, 90);
+        EXPECT_TRUE(A->intersects(B));
+        EXPECT_TRUE(B->intersects(A));
+        EXPECT_FALSE(A->contains(B));
+        EXPECT_TRUE(B->contains(A));
+        EXPECT_TRUE(A->intersection(B) != nullptr);
+        EXPECT_TRUE(B->intersection(A) != nullptr);
+    }
+
+    // Test degenerate bounding box on a line at lat=-90
+    {
+        auto A = Extent::createFromBBOX(2, -90, 3, -90);
+        auto B = Extent::createFromBBOX(-180, -90, 180, 90);
+        EXPECT_TRUE(A->intersects(B));
+        EXPECT_TRUE(B->intersects(A));
+        EXPECT_FALSE(A->contains(B));
+        EXPECT_TRUE(B->contains(A));
+        EXPECT_TRUE(A->intersection(B) != nullptr);
+        EXPECT_TRUE(B->intersection(A) != nullptr);
+    }
 }
 
 // ---------------------------------------------------------------------------