We Are Not Alone (of3a2): Set on Xen, this is the map where the Displacer Cannon is found. After witnessing Gordon Freeman teleporting to Xen, Shephard uses another portal, sending him to another Xen location featuring a Race X portal powered by a large Xen crystal from which Sprites fly and enter back to another portal located above, and a dead Survey Team member. There he witnesses a scientist teleporting high above, falling to his death on an island with a Displacer Cannon. Upon acquiring the weapon, Shephard can use it to teleport into a segment of the Training Facility, where he witnesses Vortigaunts attacking the Holographic Instructor without any effect. As Shephard is already on Xen when using the Displacer Cannon teleportation feature, it is the only teleport location not set on Xen.
Crush Depth (of3a4): From the Biodome Complex, Shephard can teleport himself to the same Xen location seen during the Resonance Cascade in Half-Life, and where the Decay bonus chapter Xen Attacks starts. There the Bullsquids drinking in the Healing Pool are still non-hostile. The portal teleporting back to Black Mesa is located behind Shephard after teleporting, in a cave.
Crush Depth (of3a5): Again from the Biodome Complex, it teleports to a Xen location where a scientist who came there with another Displacer Cannon is hanging from the cliff of an island. However Shephard does not teleport on solid ground, and falls to his death in the void. The end message then reads: "Status: Accidental death - Postmortem: Displacer Cannon self-teleport mishap". One of the islands features a Healing Pool.
Crush Depth (of3a6): Again from the Biodome Complex, it teleports to a Xen location where corpses of Survey Team members are found. A portal leads back to the Biodome Complex. It will sometimes lead to a Biodome Complex area featuring another portal teleporting back to another spot of the Xen area, then teleporting back again to the Biodome Complex.
Vicarious Reality (of4a1): Again from the Biodome Complex, it teleports to a Xen cavern where a scientist, thankful to be rescued, is found. The scientist can then teleport through the portal, but he cannot be seen after following him. There can also be found a Healing Pool, several Light Stalks and Xen crystals.
Vicarious Reality (of4a2): Again from the Biodome Complex, it teleports to a Xen area with three islands linked together vertically by a column, Xen crystals, Survey Team member corpses and two flocks of Boids.
Vicarious Reality (of4a3): Again from the Biodome Complex, it teleports to the same Xen area as the one visited in of3a6, only that the skybox is plain black. It is briefly seen, with no dead Survey Team members and no supplies, in the Blue Shift chapter Deliverance.
Pit Worm's Nest (of4a4): From Waste Processing Area 3, it teleports to a large flooded Xen cavern with Light Stalks, the corpse of a lab coat scientist and of a female HEV Suit scientist, possibly Gina Cross (as it uses the multiplayer model "gina.mdl"). Despite being set on Xen, the Pit Worm can still erroneously be heard from that area.
Pit Worm's Nest (of4a5): Again from Waste Processing Area 3, it teleports to the same Xen area as the one visited in of3a5.
Foxtrot Uniform (of5a1): From Sector G's hangar areas, it teleports to the same Xen area as the one visited in of4a1, only that there is no scientist.
Foxtrot Uniform (of5a2): Again from Sector G's hangar areas, it teleports to the same Xen area as the one visited in of3a4.
Foxtrot Uniform (of5a3): Again from Sector G's hangar areas, it teleports to the same Xen area as the one visited in of4a3.
Foxtrot Uniform (of5a4): From Sector G's Hydro-Electric Dam, it teleports to the same Xen area as the one visited in of4a4, except that it now features two portals. One portal teleports back to the hangars side of the dam, the other to the Advanced Biological Research Lab side.
"The Package" (of6a1): From the desert area located after the Hydro-Electric Dam, it teleports to the same Xen area as the one visited in of4a1. The scientist is again there, but does not teleport when walking through the portal.
"The Package" (of6a2): From outside Sector E's larger Ordinance Storage Facility, it teleports to the same Xen area as the one visited in of4a3.
"The Package" (of6a3): From Sector E's larger Ordinance Storage Facility, it teleports to the same Xen area as the one visited in of4a4. Both portals teleport back to the same spot, which changes depending on what spot Shephard is before teleporting.
"The Package" (of6a4): From the underground parking lot of Sector E's larger Ordinance Storage Facility, it teleports to the same Xen area as the one visited in of3a4.
Worlds Collide (of6a4b): From under the underground parking lot of Sector E's larger Ordinance Storage Facility, it teleports to the same Xen area as the one visited in of3a4.
Worlds Collide (of6a5): From the Gene Worm area of Sector E's larger Ordinance Storage Facility, it teleports to a Xen area featuring three islands, a dead Survey Team member and his Weapon Box, and a few Xen crystals.