On 0 servers with real players, out of 2 Steam servers that run it now, fakes and empty ones included. Checked 01:16 UTC.
surf_borderlands is a surf map: you slide along sloped ramps instead of running. It is not one of the maps that come with the game, so servers send it to players from the Workshop when they join.
Over the last 30 days surf_borderlands was the #772 map on CS2 community servers, with 2 real players on it at any moment on average - 0% of everyone playing. It ran on about <1 servers with real players at a time. Right now 0 people play it on 0 servers. It is busiest on Tuesday around 16:00 UTC and quietest on Monday around 00:00 UTC.
Right now 0, on 0 servers from the Steam server list. Over the last 30 days it had 2 real players on average at any moment. Fake servers and bots are not counted, and Valve matchmaking is not in the list.
On Tuesday around 16:00 UTC. The grid above shows every hour of the week in your own time zone.
The busiest right now: CS2 SURF #147 [RU] — CYBERSHOKE.NET (TIER 1-2 - EASY) (0 players), CS2 SURF #244 [DE] — CYBERSHOKE.NET (TIER 1-2 - EASY) (0 players). The full list is under "Servers running it now", and every server has its own page with its history.
de_mirage43,355 players on average
de_dust217,933 players on average
sandstone_fb14,456 players on average
de_mirage_fps6,345 players on average
awp_lego_25,433 players on average
awp_lego_2_fb4,845 players on average
de_mirage_christmas2,845 players on average
<null>1,272 players on average
bhop_emevaelx31,056 players on average
duels_mirage_1x11,020 players on average
de_inferno910 players on average
de_nuke780 players on average