Tall and silent, it reaches for the sky, a stone sentinel standing the test of time, marking tales untold. It points, not with fingers, but with ancient pride.

I’m neither sea, yet not quite land, A changing line of rock and sand. I hold the coast, I meet the tide What am I, where waters glide?

I wear a crown of emerald high, Drink from clouds that drift nearby. I hum with life both day and night, Yet fear the flame and fading light. What am I?

If Langerhans is after my name, I'm in your pancreas, I'm An Island but smaller I'll let you take a guess.

Found at night, lost at day. Major at times, minor at others. When you find yourself lost, I'll be the light to get you home.