The nature of the shoreline varies; to the east it includes high wavecut cliffs beneath the Mecca Hills over baymouth bars farther south, one of which reaches a length of at the Orocopia Mountains. Even farther south shingle beaches are found, showing evidence of vigorous wave activity. At East Mesa, a c. long barrier beach may have formed from sediments deposed by flash floods. Material eroded from the eastern and southwestern shores was deposited in the form of gravel and sand bars off the coast. As lake levels rose, at least one tributary stream had its valley filled in with Lake Cahuilla sediments. Tufas formed along shorelines, reaching maximum thicknesses of ; they are found especially on the northwestern shores. At the Fish Creek Mountains, beaches made up of gravel and a travertine layer on the mountain front mark the shore.