Here is the Sanskrit anuvad, Hindi anuvad, and English translation of Atma-Samyama Yoga Chapter 6, Verse 6.11.
Sanskrit
शुचौ देशे प्रतिष्ठाप्य स्थिरमासनमात्मनः । नात्युच्छ्रितं नातिनीचं चैलाजिनकुशोत्तरम् ॥ ६.११ ॥
Hindi
शुद्ध भूमिमें, जिसके ऊपर क्रमश: कुशा, मृगछाला और वस्त्र बिछे हैं, जो न बहुत ऊँचा है और न बहुत नीचा, ऐसे अपने आसनको स्थिर स्थापन करके
English
For proper meditation, the Yogi should seek a clear spot, covered with grass, deer skin and/or clothing, which is neither very high nor very low, to seat himself.