Definitions for "Mainland"
The continent; the principal land; -- opposed to island, or peninsula.
(noun) The single continent on the world containing the City of Atlantis. The continent itself extends to within 50 km of either magnetic pole, and encompasses roughly a quarter of the planet's surface.
The nearest large land to an island - Cornwall or the UK is the mainland for the Scilly Isles; Scotland is the mainland for the Orkneys.
Keywords:  miami, washington, marker, mile, north
refers to the large, land mass that begins north of mile marker 113. Includes Miami, Washington, D.C., etc.