A baymouth bar forms when a spit grows across the entire mouth of the bay. This bar acts to reduce the wave advance into the bay. With time, the entire bay may be sealed except for a small channel inlet for tides and fresh water flowing into and out of the bay.
Images
baymouth bar Burchfield, B. Clark; Foster, Robert; Keller, Edward; Melhorn, Wilton; Brookins, Douglas; Mintz, Leigh; Thurman, Harold.
Physical Geology.
Charles E. Merrill Publishing Co., 1982.
