Gran Tierra successfully drills Popa-2

Gran Tierra Energy Inc., a South American oil exploration company, has successfully drilled the Popa-2 exploration well in the Rio Magdalena Block in central Colombia.

The company, which started drilling of the Popa-2 exploration well on May 8, 2008, has reached total measured depth of 8,646 feet in basement on June 21, 2008. It expects to complete testing operations within two weeks.

In the year 2006, Gran Tierra Energy made a discovery at Popa-1, which tested approximately 160 barrels of oil per day. After that discovery, the company acquired a new 89 kilometre 2-D seismic program and used it to select the location of Popa-2.

Gran Tierra Energy, with a 100% working interest, is the operator of the 144,670 acre Rio Magdalena Block.

Dana Coffield, President and Chief Executive Officer of Gran Tierra Energy Inc., said preliminary results from Popa-2 are very exciting, building on the knowledge acquired from the drilling of Popa-1 and the new 2-D seismic data that we have acquired since then.

Testing of Popa-2 will determine the potential of this prospect and, if successful, will confirm a new exploration play on our lands in Colombia, concluded Mr. Coffield.