Minecraft wiki entry for Far_Lands, associated text: /tp (<targets>|<destination>|<x>) or /tp (<targets>|<destination>|<x>) to teleport near the Edge Far Lands. Make sure flying is on or player damage is off, as it teleports above the height limit. 0 can be really anything between roughly -12,550,820 and 12,550,820.
/tp (<targets>|<destination>|<x>) to teleport near the Corner Far Lands. Also make sure you’re protected from falling damage.