Dærenta-múþa

According to the Old English Dictionary:

Derta-múþa, an;

Dærenta-múþa

m. [múþa the mouth of a river] Dartmouth, Devonshire; Tremunda, in agro Devoniæ :-- Hí férdon to Dærentamúþan [Dertamúþan, Th. 310, 5, col. 2] they went to Dartmouth, Chr. 1049; Th. 310, 6, col. 1. dærenta-muþa