一个语法问题the natural features of an area,such as mountains,vall

一个语法问题
the natural features of an area,
such as mountains,valleys,rivers and forests,when you are thinking about them
being attractive to look at
这个是什么成分being attractive to look at
三个人三种说法，这个句子 是牛津高阶的 我认为是宾补，如果并列没有并列连词词，如果是伴随状语 那他就是伴随的伴随或俩伴随并列，没并列连词。只有宾补说的通？