A few maps in the games have areas like this... little walkable areas you can't actually get to that serve no purpose.
If you really want to check it out:
Make sure your game is closed
Go to your Documents\Baldur's Gate - Enhanced Edition folder
Right-click on "Baldur" (it's an LUA file) and "Open With --- Wordpad"
Paste the following line into the top of that file: SetPrivateProfileString('Program Options','Debug Mode','1')
Then boot up the game, CTRL+Space opens the Console/Debug window. Click "Explore" to reveal the entire map. To get to that section of land, put your cursor over it with the selected party members, and hit CTRL+J
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If you really want to check it out:
Make sure your game is closed
Go to your Documents\Baldur's Gate - Enhanced Edition folder
Right-click on "Baldur" (it's an LUA file) and "Open With --- Wordpad"
Paste the following line into the top of that file: SetPrivateProfileString('Program Options','Debug Mode','1')
Then boot up the game, CTRL+Space opens the Console/Debug window. Click "Explore" to reveal the entire map. To get to that section of land, put your cursor over it with the selected party members, and hit CTRL+J