Much of the delta is under the protection of the Danube Delta Biosphere Reserve Authority, headquartered in Tulcea, with branch offices in the delta, including in Sfântu Gheorghe. There are around 20 strictly protected areas covering about 500 sq km that are off-limits to tourists, including the 500-year-old Leţea Forest and Europe’s largest pelican colony. Visitation is limited in other areas. Note that visitors to the reserve are required to purchase an entry permit. Camping in the reserve is only allowed in official camping grounds.