The Interstate Box Lacrosse Association (IBLA) was a men's semi-professional box lacrosse league based in the United States. From 2019 to 2021, the IBLA served as an official partner of the National Lacrosse League (NLL), operating as a developmental funnel. The league was founded in 2017 to unite regional semi-professional leagues into a system similar to the Canadian Lacrosse Association structure of men's Senior A and Senior B indoor lacrosse teams. As of 2021 there are 52 total teams playing in 17 regional leagues. The Seneca Marksmen are the most recent IBLA champions, defeating the Grand Rapids Grizzlies in Lakeland, Florida on September 19, 2021. History 2017 Colorado formed the first organized regional box lacrosse league with four teams after initial in-state competition in 2016. Seeing the success of Colorado's competition model, RBLL - Minnesota was formed using the same structure. The RBLL - Portland was also added with the Portland River Monsters and Beaverton Mountaineers, but both teams folded after one season with the first bit of controversy for the IBLA. The 2017 champions were the Parker Rangers, who took down the Hastings Walleye to capture the inaugural league title. 2018 RBLL - New England and RBLL - New Jersey began play on the east coast under the IBLA structure. The midwest was organized into RBLL - Ohio and RBLL - Missouri. The second league title was awarded to the Cambridge Nor'easters after defeating the Denver Mile High Stars. 2019 The IBLA expanded again, adding new competition on the west coast in the form of RBLL - Arizona and RBLL - California. Additional midwest talent was also brought into the fold with RBLL - Nebraska. The Maine Northmen came out on top in the playoffs, beating the Louisville Canards 17 - 14 in the final game. 2020 Due to the spread of COVID-19, most teams faced shortened season schedules and the league championship tournament location was moved from Boston to Pittsburgh. By the end of the summer, 10 regions were able to crown division champions. Teams from these 10 regions were invited to compete for the IBLA Nationals league championship. For group play the teams were divided into the Steel and Maple groups. The San Diego Whalers, Grand Rapids Grizzlies, Mooncrest Munitionz, Aksarben Stampede, and Louisville Canards made up the Steel group. The Maple group consisted of the Maine Northmen, Philadelphia Phunk, Charlotte Reapers, Albany Hyenas, and Minneapolis Wheat