The Billabong Plunge 6.5m x 3.45m is built for smaller outdoor areas that need a real pool presence without moving into full family-pool scale. As the largest size in the plunge family, it gives you the most open water in the range while still holding onto the simplicity that makes a plunge pool attractive. Its rectangular proportions make it easy to pave around and easy to understand, which is a big plus when the goal is an uncluttered outdoor zone. The depth stays close to 1.67 metres throughout, giving the pool a straightforward feel in the water and a very predictable layout. At 3.45 metres wide, it strikes a sensible balance between usable swim space and a footprint that still leaves room for entertaining and landscaping. It is well suited to FNQ buyers who want relief from the heat, a clean-looking installation and a backyard that still has room to breathe.