Uranus does not have a solid surface because the upper atmosphere is gas and as you approach the core you would see the gas gradually turn into ice liquid. Hence, there really is nowhere to land on the planet. Instead the surface is defined as where the atmospheric pressure is 1 bar level.
Uranus has the fourth largest surface area of our planets at 8,083,079,690 km2 or 3,120,894,516 mi2 which is 15.847 of Earth’s surface area. The temperature at Uranus’s surface is -197°C or -322.6°F which is just a few degrees of having the coldest temperature, where Neptune has the coldest surface temperature at -201°C or -329.80°F. The composition at the surface of Uranus is hydrogen, helium and methane, but as mentioned this is not a solid surface.