  We describe laboratory experiments in a 2D wave tank that aim at building up
and monitor 2D shallow water soliton gas. The water surface elevation is
obtained over a large ($\sim 100\,\text{m}^2$) domain, with
centimetre-resolution, by stereoscopic vision using two cameras. Floating
particles are seeded to get surface texture and determine the wave field by
image correlation. With this set-up, soliton propagation and multiple
interactions can be measured with a previously unreachable level of detail. The
propagation of an oblique soliton is analysed, the amplitude decay and local
incidence are compared to analytical predictions. We further present two cases
of 2D soliton gas, emerging from multiple line solitons with random incidence
($|\theta|<30^\circ$) and from irregular random waves forced with a {\sc
jonswap} spectrum ($|\theta|<45^\circ$). To our knowledge, those are the first
observations of random 2D soliton gas for gravity waves. In both cases Mach
reflections and Mach expansions result in solitons that mainly propagate in
directions perpendicular to the wave-makers.
