https://vocabularyserver.com/adlhttps://vocabularyserver.com/adlxml.php?skosTema=93bars (physiographic) https://vocabularyserver.com/adlxml.php?skosTema=93 bends (river) RT https://vocabularyserver.com/adlxml.php?skosTema=93 islands RT https://vocabularyserver.com/adlxml.php?skosTema=93 rapids RT https://vocabularyserver.com/adlxml.php?skosTema=93 reefs RT https://vocabularyserver.com/adlxml.php?skosTema=93 physiographic features BT https://vocabularyserver.com/adlxml.php?skosTema=93 quicksand areas UF https://vocabularyserver.com/adlxml.php?skosTema=93 sandbars UF https://vocabularyserver.com/adlxml.php?skosTema=93 shoals UF https://vocabularyserver.com/adlxml.php?skosTema=93 spits UF