The Tankumsee Triathlon takes place in June at Tankumsee, organized in conjunction with the Gifhorn triathlon club and listed on triathlon-gifhorn.de. This event is established, heading into its 22nd edition. Past editions have been named the BRAWO Tankumsee Triathlon. Entries are limited to 700 participants, making it a significant local race rather than a massive competition.
The event uses the standard swim-bike-run format, with the lake providing a distinct setting. While a detailed course map is not provided, the finish line is highlighted: after one edition, Fotostudio Neuhaus processed 630 finish-line photos for participants. The race atmosphere is community-focused, with organizers sharing results, photo links, and registration information directly with athletes post-event.