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<p><em>The most southern Sumatran orangutan natural habitat is located in Batang Toru Forest Block.</em><em> This study aims to determine  use of vertical space and the daily range of Sumatran orangutans in Batang Toru Forest. </em><em>At least 17 different individual have been identified, but only 7 individual have been habituated. </em><em>This study aims to determine use of vertical space and the daily range of Sumatran orangutans in Batang Toru Forest, begun by examining 7 habituated individu. Data vertical space was collected by focal animal sampling and ad libitum by following the individual orangutan from nest in the morning until next nest in the dusk , with each 2 minute recording intervals.</em><em> Orangutans used the vertical level on 16-25 m where the fruits were abundant or at the position 72,00-82,14% from the groumd. The mean day range is </em><em>760,73-1089,28 </em><em>m. There is not difference between daily range of the orangutan adult male, adult female and adolescent</em><em> ( F = 0.119 ; p value = 0.94 ; α = 0.05).</em></p><p><em> </em></p><p><em>Keywords: daily range</em><em>, </em><em>Sumatran orangutan, vertical space</em><em></em></p>