Map Title: The canals
A 2-level playing field. Distance up top, close range below. This is a symetrical map. 4-12 players, supports Slayer, Team Slayer, and Capture the flag.

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There isn't a specific gametype save for those bungie created themselves.

Description:
This map entitled the canals 001 is a mostly-2-level playing field. On the main level, it is a fairly open field of play that supports distance gameplay. There are mancannons at either end of the level to shorten said playing field, but generally the name of the game is distance. Underneath the primary battle field is an intricate canal system that actually has a symetry to it. It supports close-combat as one could tell by the weapon placement. In the middle of the top playing field is a central "base" as it were that hosts the rocket launcher on one level and invisibility on the other. (you cannot get rockets then invisibility immediately the way the level is designed.)

This level supports capture the flag and slayer. There are respawn areas preset in Capture the flag, so you shouldn't respawn next to the enemy's flag. For slayer, the power weapons are spaced out evenly and are nerfed in at least one way. The power weapons are as follows: Rocket launcher (nerfed by invisibility and power drains), beam rifels (nerfed by the general openness of the area around where you get them), Gravity hammer (nerfed by maulers and an explosive canister under the actual hammer), Shotgun (nerfed by their conspicuous lack of ammo). Other weapons include needler x2 BR x4 Maulers x4(high respawn time), brute shot x4, various grenades, bubble shield x2, gravity lift x2, power drain x2.
[img width=800 height=600]http://img99.imageshack.us/img99/6438/canalsimg1ez0.jpg
[img width=800 height=600]http://img171.imageshack.us/img171/6439/canalsimg2qy1.jpg
[img width=800 height=600]http://img99.imageshack.us/img99/1589/canalsimg4nc8.jpg

The canal part of this level is pretty close-quarters, so I couldn't get a screen shot of it.