Abelshittim, from the Hebrew words pronounced aw-bail-hawsh-sheet-teem, meaning meadow of the acacias (acacia was a species of tree from which wood was taken to make some of the holy articles of the Tabernacle - see the Fact Finder question below) was the last site in which the Israelites camped before they crossed The Jordan River. The place name is variously rendered as either Abelshittim or Abel-shittim.
"33:49 And they pitched by Jordan, from Bethjesimoth even unto Abelshittim in the plains of Moab" (Numbers 33:49 KJV)
More often, it is also translated simply as Shittim.
"25:1 And Israel abode in Shittim" (Numbers 25:1 KJV)
"And they pitched by Jordan, from Bethjesimoth even unto Abelshittim in the plains of Moab"
Abelshittim was the last Israelite campsite (see also The Camp) in a long series of stops (see Numbers 33:1-50) along their four-decades journey from Egypt (to understand why they were given to consume forty years to complete the exodus, see A Journey Without A Destination).
"33:37 And they removed from Kadesh, and pitched in mount Hor, in the edge of the land of Edom. 33:38 And Aaron the priest went up into mount Hor at the commandment of the LORD, and died there, in the fortieth year after the children of Israel were come out of the land of Egypt, in the first day of the fifth month. 33:39 And Aaron was an hundred and twenty and three years old when he died in mount Hor.
Although Moses was not allowed to cross the Jordan (see Why Did Christ Put Moses To Death?), he was still in command at Abelshittim. The LORD gave the crossing instructions to Moses - that Moses would thereafter relay to Joshua.
"33:50 And the LORD spake unto Moses in the plains of Moab by Jordan near Jericho, saying, 33:51 Speak unto the children of Israel, and say unto them, When ye are passed over Jordan into the land of Canaan; 33:52 Then ye shall drive out all the inhabitants of the land from before you, and destroy all their pictures, and destroy all their molten images, and quite pluck down all their high places: 33:53 And ye shall dispossess the inhabitants of the land, and dwell therein: for I have given you the land to possess it. 33:54 And ye shall divide the land by lot for an inheritance among your families: and to the more ye shall give the more inheritance, and to the fewer ye shall give the less inheritance: every man's inheritance shall be in the place where his lot falleth; according to the tribes of your fathers ye shall inherit.
Fact Finder: Was the Ark of The Covenant made of shittim / acacia wood?