The Alaguali were a
Coast Miwok community of northern
San Pablo Bay in the Tolay Creek region. Alaguali lands bordered the north edge of San Pablo Bay and the southern one third of their area was low tidal marshland at the mouth of Sonoma Creek and Napa Slough. Their strong marriage ties to the Petalumas suggest that the Alagualis held all of the valley of Tolay Creek to the north of
Sears Point up to the Sonoma Valley airport, consisting of about 56 square miles. In 1814 the Spanish authorities began to split up the Alaguali amongst different missions, baptizing 91 at
Mission Dolores and 37 at
Mission San José. Padre José Altimira, the founder of
Mission San Francisco Solano, wrote in his diary on June 27, 1823, "Tolay Lake so called for the Chief of the Indians". Tolay Creek was named for the lake. ==Watershed==