Bohemia Promenade slipway, Trusthorpe

The beach here is part of Lincshore, the Environment Agency's beach nourishment scheme that has topped up the coastline from Mablethorpe to Skegness with dredged sand since 1994. Trusthorpe is named among the sites replenished under the recurring campaign, during which a dredger pumps sand ashore through a buried pipeline and sections of beach and coast path are cordoned off while the works run. The beach itself is a thin layer of sand over a marsh-clay foundation, and dries out for several hundred metres at low water.

At unusually low tides, stumps and other remains of a submerged prehistoric forest are exposed on the sand at Trusthorpe and neighbouring Sutton-on-Sea, drowned by rising sea levels long before the modern coastline formed. An eighteenth-century account measured the exposed forest at Sutton-on-Sea at around a mile wide; erosion has since narrowed what is still occasionally uncovered.

Up the coast to the north lies Mablethorpe and, beyond it, the dune system of the Saltfleetby-Theddlethorpe Dunes National Nature Reserve; south, the beach continues through Sutton-on-Sea and Sandilands towards Gibraltar Point at the mouth of the Wash. Sutton-on-Sea and Mablethorpe are both designated bathing waters.