Boundary Falls is a 6m high complex ribbon waterfall that sits on the boundary line between Hamilton and Burlington (hence its name). The crest is in Waterdown (Hamilton) and the foot is in Burlington.
| Location | 79°53'16.883"W 43°19'33.917"N |
| Park | Grindstone Creek Conservation Area |
| River | Tributary of Grindstone Creek |
| Form | Complex Ribbon Plunge |
| Flow | Seasonal |
| Crest Restriction : Access | None : Moderately Easy |
| Foot Restriction : Access | None : Moderately Easy |
| Height : Width (m) | 6.00 : 1.80 |
| Height : Width (ft) | 19 : 5 |
| Authority / Owner | Hamilton Conservation Authority |