Alternative form of still water
"The old map showed a path leading to Stillwater, which locals now just call still water."
Name of several places in the USA and elsewhere, including:
"The local newspaper often features articles about Stillwater's historic downtown district."
A city, the county seat of Washington County, Minnesota, United States.
"After visiting Stillwater to see the historic mill and visit my cousin who lives there as a local resident, I realized how charming the county seat really is."