Sullivan Lake is a beautiful area located about a half hour drive south west of the main Calabogie boulder area. In addition to the great climbing, it has amazing camping right on the lake, with great swimming access and a communal canoe and rowboat. It is well worth it to hike in a tent and supplies to spend a weekend camping.
It has around 70 established problems and features some of the largest boulders you will ever see. Large enough that there are also a handful of sport and trad routes.
Guide
The bouldering at Sullivan Lake is now fully documented in the Calabogie Bouldering guidebook (2026).
The problems are also documented on the KAYA climbing app and you can still download the free PDF mini guide (2025) here: Sullivan Lake Bouldering Mini Guide