Aranawa 荒縄
Coarse, thick straw rope; kinbaku glossaries describe it as the rice-straw rope seen in older kinbaku photographs.
Japanese dictionaries define aranawa (荒縄) as a thick rope made of straw; the Nihon Kokugo Daijiten adds that the straw is stiff and the rope rough to the touch (Kotobank). Shibari Study’s glossary explains the name as rough rope, says such rope is generally made from rice straw and notes that it is commonly seen in older kinbaku photographs. Andrea Ropes glosses it simply as rice rope and cross-refers it to waranawa, straw rope.