original: adjacent counties are marin -lrb- to the south -rrb- , mendocino -lrb- to the north -rrb- , lake -lrb- northeast -rrb- , napa -lrb- to the east -rrb- , and solano and contra costa -lrb- to the southeast -rrb- .
simplifications: neighboring counties -lrb- a political and administrative division of a state , providing certain local governmental services -lrb- in the us -rrb- -rrb- are marin -lrb- to the south -rrb- , mendocino -lrb- to the north -rrb- , lake -lrb- northeast -rrb- , napa -lrb- to the east -rrb- , and solano and contra costa -lrb- to the southeast -rrb- . neighbhouring countries 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 are all adjacent countries . adjacent counties are marin -lrb- to the south -rrb- , mendocino -lrb- to the north -rrb- , lake -lrb- northeast -rrb- , napa -lrb- to the east -rrb- , and solano and contra costa -lrb- to the southeast -rrb- . adjacent counties are marin , mendocino , lake , napa and solano . neighboring counties are marin -lrb- to the south -rrb- , mendocino -lrb- to the north -rrb- , lake -lrb- northeast -rrb- , napa -lrb- to the east -rrb- , and solano and contra costa -lrb- to the southeast -rrb- . adjacent counties are marin -lrb- to the south -rrb- , mendocino -lrb- to the north -rrb- , lake -lrb- northeast -rrb- , napa -lrb- to the east -rrb- , and solano and contra costa -lrb- to the southeast -rrb- adjacent counties are marin -lrb- to the south -rrb- , mendocino -lrb- to the north -rrb- , lake -lrb- northeast -rrb- , napa -lrb- to the east -rrb- , and solano and contra costa -lrb- to the southeast -rrb- .