Shiva Purana
क्वचित्पंकेन महता उरुतोकैश्च पातकैः ॥ लोहसूचीनिभैर्दर्भैस्सम्पन्नेन पथा क्वचित्॥ १०॥
Somewhere the place is marshy, somewhere full of long or short Darbha grass like iron pins that split the legs.
english translation
kvacitpaMkena mahatA urutokaizca pAtakaiH ॥ lohasUcInibhairdarbhaissampannena pathA kvacit॥ 10॥
hk transliteration by Sanscript