Boyd’s Bible Dictionary:

(red earth). A city of Reuben, on Jordan (Josh. 3:16).

Concise Bible Dictionary:

A town near the Jordan, named only in Joshua 3:16, which should read “a heap very far off, by [or at] Adam, the city that is beside Zaretan.” The waters of death were heaped at Adam as if to teach the death of the first man at the passage of the Jordan. Adam is identified with ed Damieh, 32° 7' N, 35° 33' E. If this is correct, the waters were piled up some 20 miles from where the Israelites crossed. See JORDAN.

Strong’s Dictionary of Hebrew Words:

the same as 120; Adam the name of the first man, also of a place in Palestine
KJV Usage:

Jackson’s Dictionary of Scripture Proper Names:

man: red earth

Potts’ Bible Proper Names:

Earthy; red earth:―a town on the River Jordan, Josh. 3:16. {Terrea}