这么which is 可以省略吗?The tower which is on the corner of the street is large.标题是“这边”

可以的，

有which is就是一个定语从句

而去掉的话就是一个介词短语来修饰了

但是不影响意思的表达

可以省略啊。
the tower is large，主要结构。on the corner of the street,修饰the tower（在街角的那个塔）

The tower which is on the corner of the street is large.
本句中, 若是采用定语从句的表达形式,则是对于the tower 起到限定的作用.
如果是 把 which is 去掉, 则成为 The tower on the corner of the street is large.
即介词短语 on the corner of the street 作为后置定语修饰 the tower ,
结构发生了变化,不过句子含义不变.
（位于街角处的那幢高楼很雄伟 ）

The tower on the corner of the street is large.这样就可以。