diff --git a/src/backports/zoneinfo/_common.py b/src/backports/zoneinfo/_common.py
index 27a6ab02..7c39fb45 100644
--- a/src/backports/zoneinfo/_common.py
+++ b/src/backports/zoneinfo/_common.py
@@ -14,7 +14,7 @@ def load_tzdata(key):
     try:
         return importlib_resources.open_binary(package_name, resource_name)
     except (ImportError, FileNotFoundError, UnicodeEncodeError):
-        # There are three types of exception that can be raised that all amount
+        # There are some types of exception that can be raised that all amount
         # to "we cannot find this key":
         #
         # ImportError: If package_name doesn't exist (e.g. if tzdata is not
@@ -25,6 +25,27 @@ def load_tzdata(key):
         # UnicodeEncodeError: If package_name or resource_name are not UTF-8,
         #   such as keys containing a surrogate character.
         raise ZoneInfoNotFoundError(f"No time zone found with key {key}")
+    except (IsADirectoryError, PermissionError):
+        # A few exceptions inherited from OSError can be raised in various scenarios:
+        #
+        # IsADirectoryError: If the resource_name links to a directory
+        #   (e.g. Australia)
+        # PermissionError: If the resource_name links to a directory on Windows
+        #   (e.g. Pacific)
+        import pathlib
+        try:
+            import importlib.util as importlib_util
+        except ImportError:
+            raise
+
+        tzdata_spec = importlib_util.find_spec("tzdata")
+        tzdata_path = pathlib.Path(tzdata_spec.origin).parent
+        resource_path = tzdata_path / "zoneinfo" / key
+
+        if resource_path.is_dir():
+            raise ZoneInfoNotFoundError(f"No time zone found with key {key}")
+        else:
+            raise
 
 
 def load_data(fobj):
diff --git a/tests/test_zoneinfo.py b/tests/test_zoneinfo.py
index b7f3fed7..b5021a6f 100644
--- a/tests/test_zoneinfo.py
+++ b/tests/test_zoneinfo.py
@@ -226,6 +226,7 @@ def test_bad_keys(self):
             "America.Los_Angeles",
             "🇨🇦",  # Non-ascii
             "America/New\ud800York",  # Contains surrogate character
+            "America",
         ]
 
         for bad_key in bad_keys:
@@ -239,6 +240,7 @@ def test_bad_keys_paths(self):
             "../zoneinfo/America/Los_Angeles",  # Traverses above TZPATH
             "America/../America/Los_Angeles",  # Not normalized
             "America/./Los_Angeles",
+            "America/"
         ]
 
         for bad_key in bad_keys: