The Latitude gives the location of a place on Earth north or south of the equator.
The Equator
There are some at -27.074386,-109.322473
There's no city there. That point is in Canadian waters of Lake Erie, about 24 miles south of downtown Detroit MI.
None. These coordinates are the Gulf of Mexico.
Lat/long is the division of the planet along a grid, the latitudes expressed as the equator and northerly or southerly bands toward each pole thru 90 degrees north or south, and longitudes expressed as perpendiculars to the equator and terminating at both poles, through 360 degrees, an arbitrary "0" being set.