The Sidoarjo mud flow or Lapindo mud, also informally abbreviated as Lusi, a contraction of Lumpur Sidoarjo (lumpur is the Indonesian word for mud), is a since May 2006 ongoing eruption of gas and mud in the subdistrict of Porong, Sidoarjo in East Java, Indonesia (20 kilometers south of Surabaya). It is considered to be a mud volcano. It appears that the flow will continue indefinitely and so far all efforts to stem the flow have failed.

source: www.wikipedia.org