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পাহাড় বা পর্বতের যে অংশ ক্রমান্বয়ে দুটি নদী-উপত্যকার মধ্যবর্তী অংশে ধীরে ধীরে নেমে যায় তাকে স্পার বলে।
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পাহাড় বা পর্বতের যে অংশ ক্রমান্বয়ে দুটি নদী-উপত্যকার মধ্যবর্তী অংশে ধীরে ধীরে নেমে যায় তাকে স্পার বলে।