Swamp tar

Swamp tar can be found in Lumbridge Swamp and Mort Myre Swamp (just north of the swamp boat). It cannot be bought from Charter Ship employees, however you may purchase swamp paste.

After starting the Lunar Diplomacy quest, you can also take swamp tar from barrels in the Lady Zay. There are four barrels on the first level down in the ship and three on the second level. A barrel contains one to twenty swamp tars. However, 2 pieces seems most common and anything above five is rare.

Cave slimes, aberrant spectres, warped tortoises, and warped terrorbirds drop swamp tar in reasonable amounts. Swamp tar can also be obtained as a reward from Big Chinchompa, as well as being generated in small amounts when smelting corrupted ore. Swamp tar can be a good money-making method for lower level players.

Making money

 * Money making guide/Collecting swamp tar from the Lady Zay
 * Money making guide/Killing cave slime

Swamp paste
When joined with flour and then heated on a fire or range, it becomes swamp paste, a sticky item used in the Shades of Mort'ton and Fishing Trawler minigames. It also plays a role in several quests. Note that swamp paste can be purchased far more cheaply from stores or the Grand Exchange.

Herb paste
Swamp tar is used in the Hunter skill as bait ingredient while catching salamanders. The bait ingredient requires herb paste which is made by using a pestle and mortar on a Guam, marrentill, tarromin or harralander.

Using the herb paste with 15 swamp tars produces: The herb tar making gives Herblore experience. Some make the tar to gain Herblore experience without spending any money, although there are faster, more expensive methods. These mixes of herbs and swamp tar are used as ammunition when a salamander is wielded as a weapon.
 * Guam tar (19 herblore, 30 exp),
 * Marrentill tar (31 herblore, 42.5 exp),
 * Tarromin tar (39 herblore, 55 exp) or
 * Harralander tar (44 herblore, 72.5 exp).

Lamp oil
Swamp tar can also be distilled into Lamp oil using either the still in the Rimmington Chemistry shop or the still at Miltog's lamp stall in the Dorgesh-Kaan marketplace. Note that a still will not load the Lamp oil into any container except an empty Oil lamp, Oil lantern, or Bullseye lantern.

Quests
Swamp tar is involved with several quests.

Swamp tar Swamp tar
 * Eagles' Peak
 * Shades of Mort'ton
 * Cold War
 * Horror from the Deep
 * Troll Romance
 * Sea Slug