A Lemster Skûtsje (= barge) is a Dutch / Frisian type of sailing boat from Lemmingen in the former Zuider Zee, now landlocked by the Ijsselmeer Dam and therefore called Ijsselmeeer.
Zuider Zee was a shallow bay of the North Sea in the northwest of the Netherlands, extending about 100 km (60 miles) inland and at most 50 km (30 miles) wide, with an overall depth of about 4 to 5 metres (13–16 feet) and a coastline of about 300 km (200 miles). It covered 5,000 km2 . Its name is Dutch for "southern sea", indicating that the name originates in Friesland, to the north of the Zuiderzee . In the 1932 the majority of the Zuiderzee was closed off from the North Sea by the construction of the Afsluitdijk, leaving the mouth of the inlet to become part of the Wadden Sea. The salt water inlet changed into a fresh water lake now called the IJsselmeer (IJssel Lake) after the river that drains into it, and by means of drainage and polders, an area of some 1,500 km2 was reclaimed as land. (WIKIPEDIA)
See a detailed map at: https://www.davidrumsey.com/luna/servlet/s/ybhi95
