Gran Tierra Energy’s initial acquisition in Peru included 100% interest Blocks 122 and 128. These 2 blocks on the eastern flank of the Marañon Basin in northern Peru, on the crest of the Iquitos Arch. Gran Tierra Energy’s presence in the Marañon Basin was expanded in September 2010 as the company announced it had entered into an agreement to farm into 3 blocks through Burlington Resources Peru Limited, a wholly owned subsidiary of ConocoPhillips. Gran Tierra Energy acquired a 20% working interest in blocks 123, 124 and 129 which cover over 6.7 million gross acres. In December 2010, Gran Tierra Energy added an additional 1.3 million gross acres through the acquisition of a 60% working interest and operatorship of block 95 in the Marañon Basin

Gran Tierra Energy acquired operatorship and 100% working interest in Blocks 107 and 133 in the Ucalayi Basin as a result of its acquisition of Petrolifera Petroleum Limited, which closed in March 2011. The acquisition adds approximately 2.1 million gross acres of land in Per