Uludağ, which is Turkey’s biggest winter sports center, is the tallest mountain of Marmara region. In clear weather, Marmara Sea and nearby ares are visible from Uludağ. Uludağ, which is Turkey’s biggest winter sports center, is the tallest mountain in Marmara region. In clear weather, Marmara Sea and closeby ares are visible from Uludağ.