Sanibel is an island and city in Lee County, Florida, United States. The population was 6,382 at the 2020 census. It is part of the Cape Coral-Fort Myers, Florida Metropolitan Statistical Area. The island, also known as Sanibel Island, constitutes the entire city. It is a barrier island—a collection of sand on the leeward side of the more solid coral-rock of Pine Island. Most of the city proper is at the east end of the island. After the Sanibel causeway was built to replace the ferry in May 1963, the city was incorporated in 1974 and the residents asserted control over development by establishing the Sanibel Comprehensive Land Use Plan, helping to maintain a balance between development and preservation of the island's ecology. In September 2022, the causeway was heavily damaged by Hurricane Ian. Due to easy causeway access, Sanibel is a popular tourist destination known for its shell beaches and wildlife refuges. More than half of the island is made up of wildlife refuges, the largest being J. N. "Ding" Darling National Wildlife Refuge. The Island hosts the Sanibel Historical Village and a variety of other museums including the Bailey-Matthews National Shell Museum. History Sanibel and Captiva formed as one island about 6,000 years ago. The first known humans in the area were the Calusa, who arrived about 2,500 years ago. The Calusa were a powerful Indian nation who came to dominate most of Southwest Florida through trade via their elaborate system of canals and waterways. Sanibel remained an important Calusa settlement until the collapse of their empire, soon after the arrival of the Europeans. During the 1700's, Cuban fishermen would seasonally travel from their homes and set up fishing camps along the Gulf Coast, called ranchos, including on Sanibel Island. In 1765, the first known appearance of a harbor on Sanibel is shown on a map as Puerto de S. Nibel (the "v" and "b" being interchangeable); thus, the name may have evolved from "San Nibel". Alternatively, the name may derive, as many believe, from "(Santa) Ybel", which survives in the old placename "Point Ybel", where the Sanibel Island Light is located. How it would have gotten this name, however, is a matter of conjecture. One story says it was named by Juan Ponce de León for Queen Isabella I of Castile; the island may indeed be named for this queen or the saint whose name she shares,