original: Adjacent counties are Marin (to the south), Mendocino (to the north), Lake (northeast), Napa (to the east), and Solano and Contra Costa (to the southeast).
simplifications: countries next to it are Marin, Mendocino, Lake, Napa, Solano, and Contra Costa. Nearby counties are Marin, Mendocino, Lake, Napa, and Solano and Contra Costa. Adjacent counties are Marin, Mendocino, Lake, Napa, Solano and Contra Costa. Neighboring counties are Marin, Mendocino, Lake, Napa, Solano, and Contra Costa. Adjacent counties are Marin (south), Mendocino (north), Lake (northeast), and Napa (east). Solano and Contra Costa are to the southeast. Counties next to it are Marin (to the south), Mendocino (to the north), Lake (northeast), Napa (to the east), and Solano and Contra Costa (to the southeast). Marin, Mendocino, Lake, Napa, Solano, and Contra Costa counties are next to it. Adjacent counties are Marin, Mendocino, Lake, Napa, Solano, and Contra Costa. Counties next door are Marin (south), Mendocino (north), Lake (northeast), Napa (east), and Solano and Contra Costa (southeast). Nearby counties are Marin (to the south), Mendocino (to the north), Lake (to the north-east), Napa (to the east), and Solano and Contra Costa (to the south-east).