Sintiki is a municipality in the Serres regional unit, Central Macedonia, Greece. The seat of the municipality is the town Sidirokastro. It is built near the fertile valley of the river Strymonas, on the bank of the Krousovitis River with natural spas and beautiful nature.The wetland habitat of the artificial Lake Kerkini, created by a dam on the Strymon River. This singular habitat, protected by the RAMSAR Convention on Wetlands, is Greece’s natural frontier with Bulgaria. It is one of the richest fowl habitats in Greece: home to more than 300 species. The Sidirokastro and Aggistro Hot Springs have a temperature around of 45°.Thousands of people go to these hot springs every year, both for recreation or therapy, especially since the recent renovation of the area’s tourist facilities.