Answer:
Ibn Sina (Son of Sina, or Avicenna as he's known in the West) has contributed to geography in many ways, see the link below.)
The above answer is only partially correct. Ibn Sina was not a cartographer nor an explorer and did not attempt to expand mankind's knowledge of landmass location. However, he was very important in the field of geology, discussing how mountains rise, basic meteorology and weather patterns, and seismic activity among other earthly phenomena.