There are several coaching institutes and online platforms that offer quality geography optional courses for UPSC preparation. These courses are designed to provide comprehensive coverage of the geography syllabus and help students develop a deep understanding of the subject. Here are some notable options:

1. Vajiram and Ravi: Vajiram and Ravi is one of the most renowned coaching institutes for UPSC preparation. They offer a dedicated geography optional course that covers both physical and human geography in detail. Their faculty members are highly experienced and provide comprehensive study material and regular doubt-clearing sessions.

2. Vision IAS: Vision IAS is another popular coaching institute that offers an excellent geography optional course. They provide detailed lectures on various topics, along with comprehensive study material and test series. The faculty at Vision IAS is known for their expertise in the subject and their ability to simplify complex concepts.

3. Drishti IAS: Drishti IAS is known for its comprehensive and well-structured geography optional course. They provide in-depth lectures, study material, and test series to help students prepare effectively. Drishti IAS also offers online classes for those who cannot attend regular classroom sessions.

4. Geography and You: Geography and You is an online platform that specializes in geography optional courses. They offer video lectures, study material, and online test series. The courses are designed by experts in the field and cover the entire geography syllabus in a systematic manner.

5. EduRev: EduRev is an online learning platform that provides a wide range of courses, including geography optional. They offer video lectures, study material, and practice quizzes to help students prepare for the UPSC exam. The courses on EduRev are designed by experienced educators and cover all the important topics in geography.

In conclusion, there are several coaching institutes and online platforms that offer quality geography optional courses for UPSC preparation. These courses provide comprehensive coverage of the subject and are designed to help students develop a deep understanding of the concepts. Whether you prefer classroom coaching or online learning, there are options available to suit your needs.