I'm reading my textbook and it says the distance between two successive nodes is equal to $\frac{1}{2} \lambda$ in standing wave.

If $\lambda$ here means the wavelength of the standing wave shouldn't it be:

when there are two nodes: $L=\lambda$

when there are three nodes: $L=\frac{1}{2} \lambda + \frac{1}{2} \lambda$

when there are three nodes: $L=\frac{1}{3}\lambda + \frac{1}{3}\lambda + \frac{1}{3}\lambda$

Does $\lambda$ here mean anything?