On 28 May 1932, at 1:02 p.m., the completion of a 32-kilometer dike known as the Afsluitdijk marked the end of the Zuiderzee, a saltwater inlet connected to the North Sea. In that moment, the Zuiderzee transformed into the IJsselmeer, a freshwater lake. This engineering feat allowed the Dutch to reclaim land from the sea. Over the following decades, three large areas of land—called polders—were drained, creating a new province called Flevoland. This province, which covers about 1,400 square kilometers, did not exist before the 20th century and lies entirely below sea level, requiring constant pumping to remain above water. The idea of building the Afsluitdijk originated in 1891 with engineer Cornelis Lely, who envisioned a dam to protect the Netherlands from flooding. However, it wasn't until 1916, after a devastating flood caused by high tides and heavy rains, that the project became a national priority. The flood revealed that existing dikes were insufficient to protect the country. Construction of the Afsluitdijk began in 1927 and was completed in 1933. It connects two regions—North Holland and Friesland—and functions as both a dike and a dam, with lock systems to allow boats to pass through. It also reduced the vulnerable coastline from over 300 kilometers to just 32 kilometers, significantly improving the country’s flood defenses. The transformation of the Zuiderzee into the IJsselmeer allowed for the creation of new land through a process called poldering. This involves surrounding an area with a low dike, pumping out the water, and allowing the land to dry. The saltwater gradually turns into freshwater through natural processes, including river inflows and rainfall. Over time, the land becomes suitable for agriculture and habitation. The first polder, the Noordoostpolder, was enclosed between 1937 and 1940 and fully drained by 1942. It became the foundation for the new province, with the city of Emmeloord rising from the mud. Similar projects followed, with the Flevoland-East and Flevoland-South polders completed in the 1950s and 1960s, giving rise to cities like Lelystad and Almere. Flevoland is now the smallest province in the Netherlands, with a land area of 1,411 square kilometers. Most of it lies below sea level, with an average elevation of -5 meters. Its cities, like Lelystad and Almere, were established in the latter half of the 20th century. The province's creation had mixed effects. For example, the island of Urk, once a fishing village, was transformed into a city surrounded by farmland after the surrounding polders were drained. Despite this change, the people of Urk still refer to themselves as living "on Urk," maintaining a connection to their maritime heritage. To preserve the memory of the old coastline, a narrow strip of water remains along the former shore. Flevoland's existence is a testament to human ingenuity in the face of nature’s challenges. The province relies on constant pumping to keep it above water, with pumping stations operating 24/7. This effort is managed by local water authorities, ensuring the balance between land and water. The Afsluitdijk and the polder system have become a model for coastal regions worldwide facing rising sea levels. As climate change threatens low-lying areas around the globe, the Netherlands' experience in living below sea level offers valuable lessons in resilience and adaptation.