A ridge is a long, narrow, elevated geomorphologic landform, structural feature, or a combination of both separated from the surrounding terrain by steep sides. The sides of a ridge slope away from a narrow top, the crest or ridgecrest, with the terrain dropping down on either side. The crest, if narrow, is also called a ridgeline. Limitations on the dimensions of a ridge are lacking. Its height above the surrounding terrain can vary from less than a meter to hundreds of meters. A ridge can be either depositional, erosional, tectonic, or a combination of these in origin and can consist of either bedrock, loose sediment, lava, or ice depending on its origin. A ridge can occur as either an isolated, independent feature or part of a larger geomorphological and/or structural feature. Frequently, a ridge can be further subdivided into smaller geomorphic or structural elements.

শৈলশিরা বা পর্বতশৃঙ্গ একটি ভৌগোলিক বৈশিষ্ট্য যা পাহাড় বা পাহাড়ের শৃঙ্খলে গঠিত যা কিছু দূরত্বে অবিচ্ছিন্ন চূড়া গঠন করে। শীর্ষ স্থান থেকে সংকীর্ণ ও দীর্ঘ অংশগুলি, উভয় প্রান্তে নিচে নেমে যাওয়া অঞ্চলকে বলা হয় রিজলাইন।